/Engine/Plugins/Editor/ObjectMixer/ObjectMixer/Source/ObjectMixer/Public/Views/List/Modes/ObjectMixerOutlinerHierarchy.h
Called when a folder is to be created
void OnBroadcastFolderCreate ( [UWorld](API\Runtime\Engine\Engine\UWorld) & InWorld, const [FFolder](API\Runtime\Engine\FFolder) & InNewFolder )